when b12 injections don t work Vitamin Deficiency: Causes, Symptoms, and Treatment Vitamin B12 Deficiency - Harvard

Our group, working with partially deficient IGF-1 mice, has demonstrated that the liver is capable of expressing IGF-1R (which under physiological conditions it does not [99]) as a defence mechanism (peer review)

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Generally, the risk of B12 toxicity or overdose is only low, but keep in mind that vitamin B12 shots may probably give other side effects